Review android section.
Review ios.
Revert selfId.
Updated title.
Fixed typo.
add statistics channel doc
Fixed null.
Fixed link.
Merge pull request #24 from leancloud/wujun_wp

fixed merge conflict.
Merge pull request #25 from lbt05/master

add statistics channel doc
update sns doc for snstype
Merge pull request #23 from leancloud/review_realtime

Review android section.
Merge pull request #26 from lbt05/master

update sns doc for snstype
补气另外一处新浪微博的snsType字符串
Merge pull request #27 from lbt05/master

补气另外一处新浪微博的snsType字符串
Fixed number.
typo
修改错别字以及不适当的*符号。